Opioids
AH-7921
Street names: Legal heroin, Doxylam
Overdose? Act now. Call emergency services — say "unresponsive, not breathing". Give naloxone for opioid-like signs. Hotlines
⚡What it does
- Morphine-like opioid synthesized in the 1940s; ~80% of morphine's potency
- Short history as a 'legal high' before scheduling
⚠Key risks
- Multiple UK deaths 2014–2015 (detected alongside etizolam and other NPS)
- Standard opioid overdose profile
- The case that ended the UK's 'legal high' tolerance — led directly to the PSA 2016
✚Overdose signs
- Respiratory depression
- Pinpoint pupils
- Unresponsive
📋Quick facts
Also known asLegal heroin, Doxylam
CategoryOpioids
Schedule / classSchedule I (US, 2015); Class A UK
AppearanceWhite/off-white powder or tablets; sold online as 'research chemical' around 2013–2015
Street priceResidual; grey-market $20–$60/g
Legal statusSchedule I US; Class A UK; controlled everywhere listed
Last updated2026-09-18
Sources: EMCDDA, DEA, NIDA
Category comparison — Opioids
| Substance | Class | Top risks | Street price |
|---|---|---|---|
| AH-7921 | Schedule I | Multiple UK deaths 2014–2015 (detected alongside etizolam and other NPS); Standard opioid overdose profile | Residual |
| U-47700 (Pink / U4) | Schedule I | Linked to multiple DEATHS before scheduling — the drug behind the 2016 'pink' overdose wave; Potency ~7× morphine | ~$20–$60/g grey-market |
Street prices are regional estimates. Potency and cuts vary constantly.
?Frequently asked questions
What does AH-7921 look like?
White/off-white powder or tablets; sold online as 'research chemical' around 2013–2015
What are the signs of a AH-7921 overdose?
Respiratory depression; Pinpoint pupils; Unresponsive Call emergency services immediately and give naloxone if available — it reverses opioid overdoses.
How addictive is it?
Multiple UK deaths 2014–2015 (detected alongside etizolam and other NPS) Dependence can develop with regular use.